TM-9-2320-280-34 HMMWV Direct Support & General Support Maintenance Manual Download
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14-17. AIR-CONDITIONING SYSTEM SERVICING (Cont'd) 1. Discharge A/C system (refer to task c.). 2. Fill flushing cylinder with flushing agent. ________ WARNING ________ Eye protection must be worn when using nitrogen. Failure to do so may result in injury to personnel. 3. Pressurize cylinder with nitrogen to 100 psi (689.5 kPa). 4. Connect flushing gun to flushing cylinder. NO T E Perform steps 5 through 7 on condenser, evaporator, and refrigerant lines. Continue flushing until there is no evidence of oil or contaminants. 5. Insert flush gun into refrigerant outlet tube of components to be flushed. 6. Connect a rubber hose over inlet of component to be flushed, and place other end of hose in a drain pan. 7. Open flush gun to blow cleaning agent through component. 8. Remove rubber hose from component and plug line. 9. Remove flush gun from component and plug line. d. Flushing System CAUTION ______ • Never flush air compressor. Flushing removes oil. Damage to compressor will result if compressor is flushed. • Air-conditioning system flushing is essential when replacing failed compressors. Failure to flush A/C system will result in damage to new compressor. NO T E • Do not attempt to use FR-12 or R-12 as a flushing agent. FR-12 or R-12 will not remain a liquid at ambient temperatures. Use R-111 or R-113 for flushing purposes. • Flushing is done to remove solid materials such as oil, sludge, and metal particles from failed components. • For a complete system flush, tools must be installed at A/C lines at compressor. TM 9-2320-280-34 14-94 Change 1